This project will investigate the fundamental creep cracking mechanism of the Gr.91 alloy at advanced power generation operating conditions to establish a link between composition, processing parameters, phase stability, microstructure, and creep resistance using the ICME approach. The project will predict the phase stability and microstructure of Gr.91 base alloy and weldment with the computational thermodynamics and kinetics - CALculation of PHAse Diagrams (CALPHAD) approach, perform welding, heat treatment, and creep test for the Gr.91 alloy, develop a model which will have excellent match with experimental data from current and previous work on Gr.91. alloy, and predict how to improve the long-term creep resistance for the Gr.91 family of alloys. utilize the integrated computational materials engineering (ICME) approach to investigate the fundamental creep cracking mechanism of Gr.91 alloys under advanced fossil fuel–fired power plants operating conditions and establish the link between composition, processing parameters, phase stability, microstructure, and creep resistance. At the end of this project, a model based on computational thermodynamics and kinetics will be developed.

Project Benefits

Development of a model that will improve the creep resistance of Gr.91 alloys for use in advanced fossil-fueled power generation systems and other applications leading to higher fossil-fueled power generation efficiency and reduced emissions.